Questioning the Idea of Grand Prix Racing

I am currently in the hobby of collecting MotoGP bike replicas. Those are quite expensive, 13.9o lion dollars a piece, compared to 9.90 of ordinary bike replicas. But, the GPs are better assembled and finished, so I say they worth the extra dollars. However, the sole reason for the difference in price I suspect, is that the toy company has to pay the teams and manufacturers for licensing matters. Might be wrong though.